Combined Turbine-magnetohydrodynamic Brayton Cycle Power System for Space and Ground UseNational Aeronautics and Space Administration, 1971 - 47 من الصفحات A combined turbine-MHD generator operating in a Brayton cycle with a NERVA nuclear reactor is considered, both for use in space and on the ground. The combined system is compared with an all-MHD Brayton system and an all-turbine system. The combined cycle systems have higher thermodynamic efficiencies than the other systems. The combined system with 1500 K turbine inlet and the all-MHD system with generator efficiency of 0.8 have the lowest specific recuperator plus radiator mass of those systems considered. But the combined system considered has an average radiator temperature of 200 to 250 K lower than the other. For ground use, a cycle efficiency of greater than 0.55 can be achieved. |
عبارات ومصطلحات مألوفة
all-MHD system Ap/p Arad Arec ature Carnot cycle combined cycle combined system comp compressor inlet temperature compressor intercooling compressor power cycle pressure ratio defined in eq efficiency of 0.8 electric power entropy equa equation 24 expander expressed in terms fractional pressure drop fractional pressure loss function of overall heat exchanger high-temperature recuperator inlet to reactor intercooled Brayton cycle isentropic logarithmic mean low-temperature recuperator Magnetohydrodynamic minimizes the specific minimum value NERVA reactor Ngen nrec overall cycle pressure overall thermodynamic cycle perature percent Pgen PL/PH plotted as function radiator area parameter radiator mass radiator temperature Rankine Cycle ratio of compressor recuperator area parameter recuperator effectiveness rewritten using equation shown in figure space specific radiator area Specific radiator parameter specific recuperator area T₁ temperature difference temperature entropy diagram temperature ratio thermodynamic cycle efficiency total specific mass turb turbine-inlet temperature written Δρ/ρ ΔΡΗ εστ